Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-3-Clause-FreeBSD identifier never was, drop -FreeBSD

There never was a BSD-3-Clause-FreeBSD SPDX identifier. Replace it
with BSD-3-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

GEOM: Fix regression after 7f16b501e25.

find_geom() in some classes trim leading "/dev/" from geom names.
Lack of that in geom_gettree_geom() broke some existing scripts.

PR: 262554
MFC after: 2 months

GEOM: Introduce partial confxml API

Traditionally the GEOM's primary channel of information from kernel to
user-space was confxml, fetched by libgeom through kern.geom.confxml
sysctl. It is convenient and informative, representing full state of
GEOM in a single XML document. But problems start to arise on systems
with hundreds of disks, where the full confxml size reaches many
megabytes, taking significant time to first write it and then parse.

This patch introduces alternative solution, allowing to fetch much
smaller XML document, subset of the full confxml, limited to 64KB and
representing only one specified geom and optionally its parents. It
uses existing GEOM control interface, extended with new "getxml" verb.
In case of any error, such as the buffer overflow, it just transparently
falls back to traditional full confxml. This patch uses the new API in
user-space GEOM tools where it is possible.

Reviewed by: imp
MFC after: 2 month
Sponsored by: iXsystems, Inc.
Differential Revision: https://reviews.freebsd.org/D34529

[skip ci] correct a few SPDX license tags

These were all incorrectly labeled as 2-clause BSD licenses by a
semi-automated process, when in fact they are 3-clause.

Discussed with: pfg, imp
MFC after: 2 weeks
Sponsored by: Axcient

lib: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Plug memory leaks when running out of memory.

Reported by: clang scan-build
MFC after: 2 weeks

Revert part of r280687, reporting "1" (true) for empty value.

For example, it made gpart partitions without label report "1" as label.

PR: 202089
MFC after: 3 days

libgeom: plug memory leak in EndElement.

CID: 1016696
Found by: Clang static checker
MFC after: 1 week

Make GEOM_PART work in presence of previous withered self.

MFC after: 2 weeks
Sponsored by: iXsystems, Inc.

Since there's no defined schema for the XML that's generated by the
kern.geom.confxml sysctl, it's silly to warn about tags in libgeom,
especially since libgeom exists simply to build a tree out of the conf
information.

Obtained from: Netflix
MFC after: 3 days

Revert r253247. This change should be improved based on a lesson learnt
from r233646 first.

Pointed out by: jmallett

Use strtoumax() instead of strtoul() for id/ref attr in XML elements.
This improves compatibility when running an ILP32 binary on LP64 kernel.

Spotted by: gjb

Improve libgeom XML parsing error handling.

- Abort parsing and return an error if we run out of memory.
- Return EILSEQ from geom_xml2tree() for XML syntax errors.

Silence on: freebsd-geom

Back out r233646. Although it fixed most libgeom consumers under 32-bit
compatibility, it broke programs using devstat, under 32-bit compatibility and
not.

It's very difficult to fix the identifiers used by devstat, so this change is
simply being backed out. Since changes to 3rd-party code seem likely, and may be
necessary to properly fix 32-bit binaries on 64-bit kernel, it would seem better
to make more invasive changes to fix GEOM's problems with 32-bit compatibility in
general.

The right thing to do is to replace all of the use of pointers as opaque
identifiers with a fixed-size (64-bit or even 32-bit should be enough for tracking
unique GEOM elments) field. That probably maintains source compatibility with
most GEOM consumers, and allows xml2tree to make better assumptions about how to
decode the identifiers.

Submitted by: Anton Yuzhaninov

Fix 32-bit libgeom consumers run on 64-bit kernels with COMPAT_FREEBSD32.

Kernel pointer values are used as opaque unique identifiers, which are then
used to reconstruct references between various providers, classes, etc., inside
libgeom from the source XML. Unfortunately, they're converted to pointer-width
integers (in the form of pointers) to do this, and 32-bit userland pointers
cannot hold sensible representations (however opaque) of 64-bit kernel pointers
on all systems.

In the case where the leading bits are zero and 32 distinct bits of pointer can
be identified, this will happen to work. On systems where the upper 32-bits of
kernel pointers are non-zero and the same for all kernel pointers, this will
result in double frees and all kinds of bizarre crashes and linkage between
objects inside libgeom.

To mitigate this problem, treat the opaque identifiers in the XML as C strings
instead, and internalize them to give unique and consistent per-object pointer
values in userland for each identifier in the XML. This allows us to keep the
libgeom logic the same with only minor changes to initial setup and parsing.

It might be more sensible for speed reasons to treat the identifiers as numbers
of a large size (uintmax_t, say) rather than strings, but strings seem fine for
now.

(As an added side-effect, this makes it slightly easier to identify unresolved
references, but nothing has been added to inform the user of those.)

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Handle null return from XML_ParserCreate and fix a few memory leaks on
error conditions.

Submitted by: Mark Johnston <mjohnston at sandvine dot com>
MFC after: 2 weeks

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Expose stripe offset and stripe size through libgeom and geom(8) userland
utilities.

Reviewed by: pjd, mav (earlier version)

- Import the HEAD csup code which is the basis for the cvsmode work.

Add sbuf_new_auto as a shortcut for the very common case of creating a
completely dynamic sbuf.

Obtained from: Varnish
MFC after: 2 weeks

- Simplify the procedure of retrieving XML-data from the kernel.
- Fix a number of potential memory leaks in libgeom related to doing realloc
without freeing old pointer if things go wrong.
- Fix a number of places in libgeom where malloc and calloc return values
were not checked.
- Check malloc return value and provide sufficient warning messages when XML
parsing fails.

PR: kern/83464
Submitted by: Dan Lukes <dan - at - obluda.cz>
Approved by: kib (mentor)

Check for NULL pointer return.

Spotted by: marcus

Make libgeom usable by C++ programs:
- Add DECL wrappers to libgeom.h.
- Rename structure members in libgeom.h to use a lg_ prefix for member
names. This is required because a few structures had members named
'class' which made g++ very unhappy.
- Catch gstat(8) and gconcat(8) up to these API changes.

Reviewed by: phk

String the consumers into the list of the provider they are attached to.

Noticed by: jhb

Constify arg to geom_lookupid().

Improve a diagnostic printf.

Leak more stuff into libgeom.